After installing plugin for single environment and enabling it through admin page, I restart the server and see the following error on any page (and nothing else):
Traceback (most recent call last):
File "/usr/lib/python2.5/site-packages/Trac-0.11dev_r6144-py2.5.egg/trac/web/api.py", line 342, in send_error
'text/html')
File "/usr/lib/python2.5/site-packages/Trac-0.11dev_r6144-py2.5.egg/trac/web/chrome.py", line 588, in render_template
template = self.load_template(filename, method=method)
File "/usr/lib/python2.5/site-packages/Trac-0.11dev_r6144-py2.5.egg/trac/web/chrome.py", line 564, in load_template
self.templates = TemplateLoader(self.get_all_templates_dirs(),
File "/usr/lib/python2.5/site-packages/Trac-0.11dev_r6144-py2.5.egg/trac/web/chrome.py", line 328, in get_all_templates_dirs
dirs += provider.get_templates_dirs()
File "build/bdist.linux-i686/egg/worklog/webui.py", line 165, in get_templates_dirs
from pkg_resources import resource_filename
SystemError: Parent module 'worklog' not loaded